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Subject[PATCH 04/28] iommu/amd: Use acpi_get_table instead of acpi_table_parse
Date
This makes it easier to propagate errors while parsing the
IVRS table and makes the amd_iommu_init_err hack obsolete.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
drivers/iommu/amd_iommu_init.c | 118 ++++++++++++++++++++++------------------
1 file changed, 66 insertions(+), 52 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 542024b..fb118bb 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -26,6 +26,8 @@
#include <linux/msi.h>
#include <linux/amd-iommu.h>
#include <linux/export.h>
+#include <linux/acpi.h>
+#include <acpi/acpi.h>
#include <asm/pci-direct.h>
#include <asm/iommu.h>
#include <asm/gart.h>
@@ -122,7 +124,7 @@ struct ivmd_header {

bool amd_iommu_dump;

-static int __initdata amd_iommu_detected;
+static bool amd_iommu_detected;
static bool __initdata amd_iommu_disabled;

u16 amd_iommu_last_bdf; /* largest PCI device id we have
@@ -149,11 +151,6 @@ bool amd_iommu_v2_present __read_mostly;
bool amd_iommu_force_isolation __read_mostly;

/*
- * The ACPI table parsing functions set this variable on an error
- */
-static int __initdata amd_iommu_init_err;
-
-/*
* List of protection domains - used during resume
*/
LIST_HEAD(amd_iommu_pd_list);
@@ -463,11 +460,9 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table)
*/
for (i = 0; i < table->length; ++i)
checksum += p[i];
- if (checksum != 0) {
+ if (checksum != 0)
/* ACPI table corrupt */
- amd_iommu_init_err = -ENODEV;
- return 0;
- }
+ return -ENODEV;

p += IVRS_HEADER_LENGTH;

@@ -1093,16 +1088,12 @@ static int __init init_iommu_all(struct acpi_table_header *table)
h->mmio_phys);

iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
- if (iommu == NULL) {
- amd_iommu_init_err = -ENOMEM;
- return 0;
- }
+ if (iommu == NULL)
+ return -ENOMEM;

ret = init_iommu_one(iommu, h);
- if (ret) {
- amd_iommu_init_err = ret;
- return 0;
- }
+ if (ret)
+ return ret;
break;
default:
break;
@@ -1483,9 +1474,15 @@ static void __init free_on_init_error(void)
*/
int __init amd_iommu_init_hardware(void)
{
+ struct acpi_table_header *ivrs_base;
+ acpi_size ivrs_size;
+ acpi_status status;
int i, ret = 0;

- if (!amd_iommu_detected)
+ if (no_iommu || (iommu_detected && !gart_iommu_aperture))
+ return -ENODEV;
+
+ if (amd_iommu_disabled || !amd_iommu_detected)
return -ENODEV;

if (amd_iommu_dev_table != NULL) {
@@ -1493,16 +1490,21 @@ int __init amd_iommu_init_hardware(void)
return 0;
}

+ status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
+ if (status == AE_NOT_FOUND)
+ return -ENODEV;
+ else if (ACPI_FAILURE(status)) {
+ const char *err = acpi_format_exception(status);
+ pr_err("AMD-Vi: IVRS table error: %s\n", err);
+ return -EINVAL;
+ }
+
/*
* First parse ACPI tables to find the largest Bus/Dev/Func
* we need to handle. Upon this information the shared data
* structures for the IOMMUs in the system will be allocated
*/
- if (acpi_table_parse("IVRS", find_last_devid_acpi) != 0)
- return -ENODEV;
-
- ret = amd_iommu_init_err;
- if (ret)
+ if (find_last_devid_acpi(ivrs_base))
goto out;

dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE);
@@ -1559,22 +1561,13 @@ int __init amd_iommu_init_hardware(void)
* now the data structures are allocated and basically initialized
* start the real acpi table scan
*/
- ret = -ENODEV;
- if (acpi_table_parse("IVRS", init_iommu_all) != 0)
- goto free;
-
- if (amd_iommu_init_err) {
- ret = amd_iommu_init_err;
- goto free;
- }
-
- if (acpi_table_parse("IVRS", init_memory_definitions) != 0)
+ ret = init_iommu_all(ivrs_base);
+ if (ret)
goto free;

- if (amd_iommu_init_err) {
- ret = amd_iommu_init_err;
+ ret = init_memory_definitions(ivrs_base);
+ if (ret)
goto free;
- }

ret = amd_iommu_init_devices();
if (ret)
@@ -1587,12 +1580,16 @@ int __init amd_iommu_init_hardware(void)
register_syscore_ops(&amd_iommu_syscore_ops);

out:
+ /* Don't leak any ACPI memory */
+ early_acpi_os_unmap_memory((char *)ivrs_base, ivrs_size);
+ ivrs_base = NULL;
+
return ret;

free:
free_on_init_error();

- return ret;
+ goto out;
}

static int amd_iommu_enable_interrupts(void)
@@ -1610,6 +1607,26 @@ out:
return ret;
}

+static bool detect_ivrs(void)
+{
+ struct acpi_table_header *ivrs_base;
+ acpi_size ivrs_size;
+ acpi_status status;
+
+ status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
+ if (status == AE_NOT_FOUND)
+ return false;
+ else if (ACPI_FAILURE(status)) {
+ const char *err = acpi_format_exception(status);
+ pr_err("AMD-Vi: IVRS table error: %s\n", err);
+ return false;
+ }
+
+ early_acpi_os_unmap_memory((char *)ivrs_base, ivrs_size);
+
+ return true;
+}
+
/*
* This is the core init function for AMD IOMMU hardware in the system.
* This function is called from the generic x86 DMA layer initialization
@@ -1669,29 +1686,26 @@ free:
* IOMMUs
*
****************************************************************************/
-static int __init early_amd_iommu_detect(struct acpi_table_header *table)
-{
- return 0;
-}
-
int __init amd_iommu_detect(void)
{
+
if (no_iommu || (iommu_detected && !gart_iommu_aperture))
return -ENODEV;

if (amd_iommu_disabled)
return -ENODEV;

- if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
- iommu_detected = 1;
- amd_iommu_detected = 1;
- x86_init.iommu.iommu_init = amd_iommu_init;
+ if (!detect_ivrs())
+ return -ENODEV;

- /* Make sure ACS will be enabled */
- pci_request_acs();
- return 1;
- }
- return -ENODEV;
+ amd_iommu_detected = true;
+ iommu_detected = 1;
+ x86_init.iommu.iommu_init = amd_iommu_init;
+
+ /* Make sure ACS will be enabled */
+ pci_request_acs();
+
+ return 0;
}

/****************************************************************************
--
1.7.9.5



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